how to get in python real position of object that follows a NurbsPath?
To get the global position of an object in blender use

obj.matrix_world.to_translation()


To change the frame use

scene.frame_set(frame)


...

import bpy

sce = bpy.context.scene

obj = bpy.data.objects["tracker0"]


for i in range(0, 20):
    sce.frame_set(i)
    print(obj.matrix_world.to_translation())